活性玉米芯与膨润土对原水中铅、镍的去除效果比较分析

IF 0.6 Q4 ENGINEERING, CIVIL Slovak Journal of Civil Engineering Pub Date : 2021-06-01 DOI:10.2478/sjce-2021-0011
Uchechi Akomah, I. Nwaogazie, O. Akaranta, A. David
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引用次数: 2

摘要

摘要商业活性炭作为吸附剂广泛用于工业废水的净化,由于其操作成本高,对中小型企业来说并不经济。本研究旨在比较膨润土和活性玉米芯(“BC”和“ACC”)对水溶液中铅(II)和镍(II)离子的吸附能力。从BC和ACC的表征中获得的结果是pH:7.43和6.74;水分含量分别为36.45kg/kg和12.10kg/kg,堆积密度分别为1.243g/ml和1.162g/ml。使用偏度系数的正态性测试表明,这组数据不是正态分布的。使用Friedman的双向方差分析检验进行的方差分析(ANOVA)检验显示p值为0.0253,而α值为0.05,这表明显著性。Friedman结果表明,在不同的剂量、初始浓度和接触时间方面具有显著性。吸附剂的作用不显著。使用Langmuir、Freundlich和Temkin等温线分析吸附等温线。大多数研究表明,使用大多数低成本材料进行的吸附实验倾向于遵循Freundlich吸附等温线,但实验结果表明,活性玉米芯和膨润土的Temkin吸附等温线较好,膨润土吸附等温线分别为0.879≤R2≤0.917和0.9572≤R2≤0.99。研究表明,这些材料是很好的吸附剂,可用于从水溶液中去除铅(II)和镍(II)离子。
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Comparative analysis of Activated Corn Cob and Bentonite Clay for the Removal of Lead and Nickel from Raw Water
Abstract The extensive use of commercial activated carbon as an adsorbent for the purification of industrial effluent is not economical for small and medium-sized enterprises due to its high operational cost. This study was carried out to compare the adsorptive capacity of bentonite clay and activated corn cob (“BC” and “ACC”) for the removal of lead (II) and nickel (II) ions from an aqueous solution. The results obtained from the characterization of the BC and ACC are pH: 7.43 and 6.74; moisture content: 36.45kg/kg and 12.10kg/kg, and bulk density: 1.243g/ml and 1.162g/ml, respectively. Normality tests using the coefficient of skewness indicated that the set of data was not normally distributed. An analysis of variance (ANOVA) test conducted using Friedman’s 2-way ANOVA test indicated p values of 0.0253 against an alpha value of 0.05, which indicates significance. The Friedman results indicated significance with respect to the varied dosages, initial concentrations, and contact time. The effect of the adsorbent was not significant. The adsorption isotherms were analysed using the Langmuir, Freundlich, and Temkin isotherms. Most research studies have shown that adsorption experiments performed using most low-cost materials tend to follow the Freundlich adsorption isotherm, but the results of this experimental study proved that activated corn cob and bentonite clay performed better with the Temkin adsorption isotherm with 0.879 ≤ R2 ≤ 0.917 for the bentonite clay and 0.9572 ≤ R2 ≤ 0.99 for the activated corn cob respectively. The study revealed that these materials are good adsorbents that can be used for the removal of lead (II) and nickel (II) ions from an aqueous solution.
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